I'm just looking into developing a photoresist PCB. I bought a kit that contains a photoresist single sided PCB, developer solution (in powder form to mix with water), etchant, and a tank.
I have printed my circuit diagram on an inkjet transparency.
The only thing I was missing was a UV light to develop the photoresist. I tried it with a standard lamp and had no results after ~20 minutes, so I figured I needed a genuine UV light. It's too dark in the evenings this time of year for me to be able to do it outside.
I am looking into buying one of those bank note checkers that shops use to check for counterfeit money. It's a downward facing 4W bulb - here:
Will this be sufficient to develop my photoresist? I don't need it done in a hurry and don't mind waiting a long time.
Update: Well I'm happy to confirm I got decent results from using the note checker, OHP inkjet transparencies, and some positive photoresist from Maplin. I just did a test, around 8 minutes under the lamp, then I got called for dinner! So about half an hour later, dunked it in a reasonably weak developer solution - maybe 100ml of water and two or three sprinkles of Sodium Hydroxide.
As you can see, the one closest to the camera turned out well (the scrappy bit on the side is because I cut the board with tin snips - not a great idea - and had a bit of the protective film left which I peeled away. It made for a good comparison). It's a bit weak in places, but those square pads on the right are perfect. The one behind it, not so much. I think I overexposed that one. It was the cheap board that came with the kit.